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You can file a married filing separate return. Your exclusion of foreign income is not limited by your filing status.
You need not notate anywhere on your return that your spouse has surrendered their green card. His filing is his responsibility.
You cannot take the credit for child and dependent care expenses when filing MFS.
The child tax credit has income levels reduced to half that of joint return so you may not qualify.
You can respond below I answered pretty quick like you wanted
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